Prove that this is true for every n. (n is an element of natural numbers)

cos(n*pi) = (-1)^n

I would very much appreciate your help, thank you.

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- October 29th 2012, 11:17 AMjakobjakobsolving trigonometric equation using mathematical induction
Prove that this is true for every n. (n is an element of natural numbers)

cos(n*pi) = (-1)^n

I would very much appreciate your help, thank you. - October 29th 2012, 11:31 AMjohnsomeoneRe: solving trigonometric equation using mathematical induction
- October 29th 2012, 12:02 PMjakobjakobRe: solving trigonometric equation using mathematical induction
Thank you for your help.